new jersey school system. the philanthropic gesture some say was designed to draw attention away from "the social network," a new movie loosely based on facebook. you might want to have over to the national mall this weekend. tomorrow from 10-5:30, the library of congress will hold its 10th annual book festival. for more details, go to tbd.com. when you are finished at the mall, you and have -- you can head to a national park for free. national parks are free on saturday. the national park service is looking for americans to roll up their sleeves and get involved in a day of service. even if you don't volunteer, the entrance fees will be waived. what kind of day will be for them to get out tomorrow?